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From:   Jeff Layton <jlayton@kernel.org>
To:     chuck.lever@oracle.com
Cc:     linux-nfs@vger.kernel.org, Petr Vorel <pvorel@suse.cz>
Subject: [PATCH v2] nfsd: fix net-namespace logic in __nfsd_file_cache_purge
Date:   Mon, 31 Oct 2022 11:49:21 -0400
Message-Id: <20221031154921.500620-1-jlayton@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

If the namespace doesn't match the one in "net", then we'll continue,
but that doesn't cause another rhashtable_walk_next call, so it will
loop infinitely.

Fixes: ce502f81ba88 ("NFSD: Convert the filecache to use rhashtable")
Reported-by: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/nfsd/filecache.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

The v1 patch applies cleanly to v6.0, but not to Chuck's for-next
branch. This one should be suitable there.
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 98c6b5f51bc8..4a8aa7cd8354 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -890,9 +890,8 @@ __nfsd_file_cache_purge(struct net *net)
 
 		nf = rhashtable_walk_next(&iter);
 		while (!IS_ERR_OR_NULL(nf)) {
-			if (net && nf->nf_net != net)
-				continue;
-			nfsd_file_unhash_and_dispose(nf, &dispose);
+			if (!net || nf->nf_net == net)
+				nfsd_file_unhash_and_dispose(nf, &dispose);
 			nf = rhashtable_walk_next(&iter);
 		}
 
-- 
2.38.1